On top of the table, a metal sphere attached to the magnet moves through craft sand to draw attractive patterns. An Arduino and Raspberry Pi work together to command the stepper motors to create ...

[Nick] is working on a prototype of a coffee table sand plotter that draws patterns in sand a lot like a zen rock garden. [Nick]’s zen rock garden uses a magnet to draw a ball bearing across ...

It's built using an existing table that's been fitting with a Raspberry Pi, a motor, a magnet, and housing for the sand so that a metal ball can be moved about the bottom to draw the images.